Revert "cpufreq: Initial CPU utilization should be 0"

This reverts commit fd7d5d7409a276c08fcd277f353e52113285ad55.
Revert "cpufreq: create a helper function to get CPU utilization. Picked from @stratosk"

This reverts commit c926a6cad94dea0b6fb2e03d09ac1685c5ec7091.